Exhaust system



FIG. 1 is a perspective view of an exhaust system showing our new design, the broken line showing of an agricultural vehicle forms no part of the claimed design;

FIG. 2 is a perspective view of the exhaust system;

FIG. 3 is a right side elevation view of the exhaust system;

FIG. 4 is a left side elevation view of the exhaust system;

FIG. 5 is a top view of the exhaust system;

FIG. 6 is a bottom view of the exhaust system;

FIG. 7 is a back view of the exhaust system; and,

FIG. 8 is a front view of the exhaust system. 

CLAIM The ornamental design for an exhaust system, substantially as shown and described. 